摘要
以熔融法制备的R2O-CaO-SiO2-Al2O3-F(RCSAF)系微晶玻璃为研究对象,利用热重分析、X射线衍射等手段分析微晶玻璃的形核和晶体生长动力学。借助Gaussian拟合,获得了微晶玻璃的形核和晶体生长动力学函数。并绘制了非等温加热条件下R2O-CaO-SiO2-Al2O3-F系微晶玻璃的温度–时间–转变(T–T–T)曲线,获得了微晶玻璃形核和晶体生长动力学Gaussian拟合函数关系模型。通过无模式函数模型计算得知微晶玻璃的析晶活化能Ea=357.74 k J/mol,析晶指数n=3.13,微晶玻璃以整体析晶的方式析出晶体。确立了时间、温度和析出晶相对R2O-CaO-SiO2-Al2O3-F系微晶玻璃析晶率曲线的影响规律。微晶玻璃析出的CaF2晶体颗粒均匀弥散的分布于硅碱钙石和α-硅碱钙石中,扫描电子显微镜照片呈现的典型晶体结构进一步验证了RCSAF系微晶玻璃的晶体析出过程。
R2O-CaO-SiO2-Al2O3-F(RCSAF)glass-ceramics were prepared via melting method.The nucleation and crystal growth kinetics of RCSAF glass-ceramics were analyzed by thermogravimetric analysis and X-ray diffraction.The nucleation and crystal growth kinetics of the glass-ceramics were obtained by Gaussian fitting.The temperature–time–transition(T–T–T)curve of R2O-CaO-SiO2-Al2O3-F glass-ceramics under non-isothermal heating conditions was obtained,and the Gaussian fitting of glass-ceramics and crystal growth kinetics were obtained.The crystallization kinetic parameters including the crystallization apparent activation energy(Ea)and the crystallization index(n)were also measured with Ozawa and JMA methods(i.e.Ea=357.74 kJ/mol,n=3.13).Effects of time,temperature and precipitated crystal phase on the crystallization rate curve of R2O-CaO-SiO2-Al2O3-F glass-ceramics were established.The CaF2 crystal particles precipitated from glass-ceramics were uniformly distributed in canasite andα-canasite.The crystal precipitation process of RCSAF glass-ceramics was further verified by typical crystal structure presented in scanning electron microscopic images.
作者
赵庆朝
杨航
曹建尉
李伟光
申士富
刘海营
ZHAO Qingchao;YANG Hang;CAO Jianwei;LI Weiguang;SHEN Shifu;LIU Haiying(Beijing General Research Institute of Mining&Metallurgy,Beijing 100160,China;National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2020年第7期1114-1121,共8页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(51604029)。
